I know what Pete said. I disagree with what he says. The fundamental disagreement we are having is: I think internal is natural, and Pete thinks it is unnatural. Now we are trying to hash out what we do agree on.

The quote you used was talking about the word "dantian" not the word "internal".

Moving your body in the way I described seems pretty natural to me. I've also seen people walk in off the street that use their body naturally this way. When you find a “gifted” athlete, this is what I believe people are referring to.

Rob John.
Yes, you know what your teacher means by dantain. And I know what mine means by it. And I know how I use it, and you how you use it, but that doesn't mean we agree on what the word means.